cocos-engine/native/cocos/physics/physx/PhysXEventManager.cpp

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#include "physics/physx/PhysXEventManager.h"
#include <algorithm>
#include "physics/physx/PhysXInc.h"
#include "physics/physx/PhysXUtils.h"
#include "physics/physx/shapes/PhysXShape.h"
#include "physics/spec/IWorld.h"

namespace cc {
namespace physics {

void PhysXEventManager::SimulationEventCallback::onTrigger(physx::PxTriggerPair *pairs, physx::PxU32 count) {
    for (physx::PxU32 i = 0; i < count; i++) {
        const physx::PxTriggerPair &tp = pairs[i];
        if (tp.flags & (physx::PxTriggerPairFlag::eREMOVED_SHAPE_TRIGGER | physx::PxTriggerPairFlag::eREMOVED_SHAPE_OTHER)) {
            continue;
        }

        const auto &selfIter  = getPxShapeMap().find(reinterpret_cast<uintptr_t>(tp.triggerShape));
        const auto &otherIter = getPxShapeMap().find(reinterpret_cast<uintptr_t>(tp.otherShape));
        if (selfIter == getPxShapeMap().end() || otherIter == getPxShapeMap().end()) {
            continue;
        }

        const auto &self  = selfIter->second;
        const auto &other = otherIter->second;
        auto &      pairs = mManager->getTriggerPairs();
        const auto &iter  = std::find_if(pairs.begin(), pairs.end(), [self, other](std::shared_ptr<TriggerEventPair> &pair) {
            return (pair->shapeA == self || pair->shapeA == other) && (pair->shapeB == self || pair->shapeB == other);
        });
        if (tp.status & physx::PxPairFlag::eNOTIFY_TOUCH_FOUND) {
            if (iter == pairs.end()) pairs.push_back(std::shared_ptr<TriggerEventPair>(new TriggerEventPair{self, other}));
        } else if (tp.status & physx::PxPairFlag::eNOTIFY_TOUCH_LOST) {
            if (iter != pairs.end()) iter->get()->state = ETouchState::EXIT;
        }
    }
}

void PhysXEventManager::SimulationEventCallback::onContact(const physx::PxContactPairHeader & /*header*/, const physx::PxContactPair *pairs, physx::PxU32 count) {
    for (physx::PxU32 i = 0; i < count; i++) {
        const physx::PxContactPair &cp = pairs[i];
        if (cp.flags & (physx::PxContactPairFlag::eREMOVED_SHAPE_0 | physx::PxContactPairFlag::eREMOVED_SHAPE_1)) {
            continue;
        }

        const auto &selfIter  = getPxShapeMap().find(reinterpret_cast<uintptr_t>(cp.shapes[0]));
        const auto &otherIter = getPxShapeMap().find(reinterpret_cast<uintptr_t>(cp.shapes[1]));
        if (selfIter == getPxShapeMap().end() || otherIter == getPxShapeMap().end()) {
            continue;
        }

        const auto &self  = selfIter->second;
        const auto &other = otherIter->second;
        auto &      pairs = mManager->getConatctPairs();
        auto        iter  = std::find_if(pairs.begin(), pairs.end(), [self, other](std::shared_ptr<ContactEventPair> &pair) {
            return (pair->shapeA == self || pair->shapeA == other) && (pair->shapeB == self || pair->shapeB == other);
        });

        if (iter == pairs.end()) {
            pairs.push_back(std::shared_ptr<ContactEventPair>(new ContactEventPair{self, other}));
            iter = pairs.end() - 1;
        }

        if (cp.events & physx::PxPairFlag::eNOTIFY_TOUCH_PERSISTS) {
            iter->get()->state = ETouchState::STAY;
        } else if (cp.events & physx::PxPairFlag::eNOTIFY_TOUCH_FOUND) {
            iter->get()->state = ETouchState::ENTER;
        } else if (cp.events & physx::PxPairFlag::eNOTIFY_TOUCH_LOST) {
            iter->get()->state = ETouchState::EXIT;
        }

        const physx::PxU8 &contactCount = cp.contactCount;
        iter->get()->contacts.resize(contactCount);
        if (contactCount > 0) {
            cp.extractContacts(reinterpret_cast<physx::PxContactPairPoint *>(&iter->get()->contacts[0]), contactCount);
        }
    }
}

void PhysXEventManager::refreshPairs() {
    for (auto iter = getTriggerPairs().begin(); iter != getTriggerPairs().end();) {
        const auto &selfIter  = getPxShapeMap().find(reinterpret_cast<uintptr_t>(&(reinterpret_cast<PhysXShape *>(iter->get()->shapeA)->getShape())));
        const auto &otherIter = getPxShapeMap().find(reinterpret_cast<uintptr_t>(&(reinterpret_cast<PhysXShape *>(iter->get()->shapeB)->getShape())));
        if (selfIter == getPxShapeMap().end() || otherIter == getPxShapeMap().end()) {
            iter = getTriggerPairs().erase(iter);
        } else if (iter->get()->state == ETouchState::EXIT) {
            iter = getTriggerPairs().erase(iter);
        } else {
            iter->get()->state = ETouchState::STAY;
            iter++;
        }
    }

    getConatctPairs().clear();
}

} // namespace physics
} // namespace cc